.tt-wrapper {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 20px;
    color: #333;
}
.tt-header {
    height: 80px;
    line-height: 80px;
    border-bottom: 3px solid #ccc;
}
.tt-header .button > button {
    border: 1px solid #ccc;
    padding: 10px 20px;
    vertical-align: middle;
    cursor: pointer;
}
.tt-header .button > button.active {
    background-color: deepskyblue;
    color: #fff;
}

.tt-main {
    height: 600px;
    background-color: #f0f0f0;
}
.tt-map {
    width: 600px;
    height: 600px;
    background-color: skyblue;
}
.tt-map ul {
    height: 30px;
}
.tt-map ul li {
    width: 30px;
    height: 30px;
    border: 1px solid #fff;
    box-sizing: border-box;
    float: left;
}
.tt-map ul li.snake {
    background-color: blue;
}
.tt-map ul li.snake.head {
    background-color: orange;
}
.tt-map ul li.food {
    background-color: red;
}

.tt-footer {
    height: 60px;
    border-top: 3px solid #ccc; 
}
.tt-footer .score span {
    color: red;
    font-size: 45px;
    font-weight: bold;
}